text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2006 Wojciech A. Koszek <wkoszek@FreeBSD.org>
   * Copyright (c) 2012-2014 Robert N. M. Watson
   * All rights reserved.
   *
   * This software was developed by SRI International and the University of
   * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
   * ("CTSRD"), as part of the DARPA CRASH research programme.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include "opt_ddb.h"
  #include "opt_platform.h"
  
  #include <sys/param.h>
  #include <sys/conf.h>
  #include <sys/kernel.h>
  #include <sys/systm.h>
  #include <sys/imgact.h>
  #include <sys/bio.h>
  #include <sys/buf.h>
  #include <sys/bus.h>
  #include <sys/cpu.h>
  #include <sys/cons.h>
  #include <sys/exec.h>
  #include <sys/linker.h>
  #include <sys/ucontext.h>
  #include <sys/proc.h>
  #include <sys/kdb.h>
  #include <sys/ptrace.h>
  #include <sys/reboot.h>
  #include <sys/signalvar.h>
  #include <sys/sysent.h>
  #include <sys/sysproto.h>
  #include <sys/user.h>
  
  #ifdef FDT
  #include <dev/fdt/fdt_common.h>
  #include <dev/ofw/openfirm.h>
  #include <dev/ofw/ofw_subr.h>
  #endif
  
  #include <vm/vm.h>
  #include <vm/vm_param.h>
  #include <vm/vm_object.h>
  #include <vm/vm_page.h>
  #include <vm/vm_phys.h>
  
  #include <machine/bootinfo.h>
  #include <machine/clock.h>
  #include <machine/cpu.h>
  #include <machine/cpuregs.h>
  #include <machine/hwfunc.h>
  #include <machine/md_var.h>
  #include <machine/metadata.h>
  #include <machine/pmap.h>
  #include <machine/trap.h>
  
  extern int	*edata;
  extern int	*end;
  
  void
  platform_cpu_init()
  {
  	/* Nothing special */
  }
  
  static void
  mips_init(void)
  {
  	int i;
  #ifdef FDT
  	struct mem_region mr[FDT_MEM_REGIONS];
  	uint64_t val;
  	int mr_cnt;
  	int j;
  #endif
  
  	for (i = 0; i < 10; i++) {
  		phys_avail[i] = 0;
  	}
  
  	/* phys_avail regions are in bytes */
  	phys_avail[0] = MIPS_KSEG0_TO_PHYS(kernel_kseg0_end);
  	phys_avail[1] = ctob(realmem);
  
  	dump_avail[0] = phys_avail[0];
  	dump_avail[1] = phys_avail[1];
  
  	physmem = realmem;
  
  #ifdef FDT
  	if (fdt_get_mem_regions(mr, &mr_cnt, &val) == 0) {
  
  		physmem = btoc(val);
  
  		KASSERT((phys_avail[0] >= mr[0].mr_start) && \
  			(phys_avail[0] < (mr[0].mr_start + mr[0].mr_size)),
  			("First region is not within FDT memory range"));
  
  		/* Limit size of the first region */
  		phys_avail[1] = (mr[0].mr_start + MIN(mr[0].mr_size, ctob(realmem)));
  		dump_avail[1] = phys_avail[1];
  
  		/* Add the rest of regions */
  		for (i = 1, j = 2; i < mr_cnt; i++, j+=2) {
  			phys_avail[j] = mr[i].mr_start;
  			phys_avail[j+1] = (mr[i].mr_start + mr[i].mr_size);
  			dump_avail[j] = phys_avail[j];
  			dump_avail[j+1] = phys_avail[j+1];
  		}
  	}
  #endif
  
  	init_param1();
  	init_param2(physmem);
  	mips_cpu_init();
  	pmap_bootstrap();
  	mips_proc0_init();
  	mutex_init();
  	kdb_init();
  #ifdef KDB
  	if (boothowto & RB_KDB)
  		kdb_enter(KDB_WHY_BOOTFLAGS, "Boot flags requested debugger");
  #endif
  }
  
  /*
   * Perform a board-level soft-reset.
   */
  void
  platform_reset(void)
  {
  
  	/* XXX SMP will likely require us to do more. */
  	__asm__ __volatile__(
  		"mfc0 $k0, $12\n\t"
  		"li $k1, 0x00100000\n\t"
  		"or $k0, $k0, $k1\n\t"
  		"mtc0 $k0, $12\n");
  	for( ; ; )
  		__asm__ __volatile("wait");
  }
  
  void
  platform_start(__register_t a0, __register_t a1,  __register_t a2, 
      __register_t a3)
  {
  	struct bootinfo *bootinfop;
  	vm_offset_t kernend;
  	uint64_t platform_counter_freq;
  	int argc = a0;
  	char **argv = (char **)a1;
  	char **envp = (char **)a2;
  	long memsize;
  #ifdef FDT
  	vm_offset_t dtbp;
  	void *kmdp;
  #endif
  	int i;
  
  	/* clear the BSS and SBSS segments */
  	kernend = (vm_offset_t)&end;
  	memset(&edata, 0, kernend - (vm_offset_t)(&edata));
  
  	mips_postboot_fixup();
  
  	mips_pcpu0_init();
  
  	/*
  	 * Over time, we've changed out boot-time binary interface for the
  	 * kernel.  Miniboot simply provides a 'memsize' in a3, whereas the
  	 * FreeBSD boot loader provides a 'bootinfo *' in a3.  While slightly
  	 * grody, we support both here by detecting 'pointer-like' values in
  	 * a3 and assuming physical memory can never be that back.
  	 *
  	 * XXXRW: Pull more values than memsize out of bootinfop -- e.g.,
  	 * module information.
  	 */
  	if (a3 >= 0x9800000000000000ULL) {
  		bootinfop = (void *)a3;
  		memsize = bootinfop->bi_memsize;
  		preload_metadata = (caddr_t)bootinfop->bi_modulep;
  	} else {
  		bootinfop = NULL;
  		memsize = a3;
  	}
  
  #ifdef FDT
  	/*
  	 * Find the dtb passed in by the boot loader (currently fictional).
  	 */
  	kmdp = preload_search_by_type("elf kernel");
  	dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
  
  #if defined(FDT_DTB_STATIC)
  	/*
  	 * In case the device tree blob was not retrieved (from metadata) try
  	 * to use the statically embedded one.
  	 */
  	if (dtbp == (vm_offset_t)NULL)
  		dtbp = (vm_offset_t)&fdt_static_dtb;
  #else
  #error	"Non-static FDT not yet supported on BERI"
  #endif
  
  	if (OF_install(OFW_FDT, 0) == FALSE)
  		while (1);
  	if (OF_init((void *)dtbp) != 0)
  		while (1);
  
  	/*
  	 * Configure more boot-time parameters passed in by loader.
  	 */
  	boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int);
  	init_static_kenv(MD_FETCH(kmdp, MODINFOMD_ENVP, char *), 0);
  
  	/*
  	 * Get bootargs from FDT if specified.
  	 */
  	ofw_parse_bootargs();
  #endif
  
  	/*
  	 * XXXRW: We have no way to compare wallclock time to cycle rate on
  	 * BERI, so for now assume we run at the MALTA default (100MHz).
  	 */
  	platform_counter_freq = MIPS_DEFAULT_HZ;
  	mips_timer_early_init(platform_counter_freq);
  
  	cninit();
  	printf("entry: platform_start()\n");
  
  	bootverbose = 1;
  	if (bootverbose) {
  		printf("cmd line: ");
  		for (i = 0; i < argc; i++)
  			printf("%s ", argv[i]);
  		printf("\n");
  
  		printf("envp:\n");
  		for (i = 0; envp[i]; i += 2)
  			printf("\t%s = %s\n", envp[i], envp[i+1]);
  
  		if (bootinfop != NULL)
  			printf("bootinfo found at %p\n", bootinfop);
  
  		printf("memsize = %p\n", (void *)memsize);
  	}
  
  	realmem = btoc(memsize);
  	mips_init();
  
  	mips_timer_init_params(platform_counter_freq, 0);
  }
  